Sorry, i’ve been out of the loop for a while. I can’t use Unity 3 to develop iOS apps (because my iPhone basic license is for Unity 2.x). So what are my options? Can I download an older version of Unity 2.x and use it with the latest iOS SDK + Xcode 4? If so where do I download the last good v2 release of Unity?
Yes, it will still work. You may need to do some surgery in the XCode project to make it work with the latest Apple SDKs and XCode version (I am not sure). You can get iPhone 1.7.0 from:
http://download.unity3d.com/download_unity/unity_iphone-1.7.0.dmg